DAVID Cameron’s allies are desperately fighting to stop a bandwagon that could see wannabe prime minister Boris Johnson realise his dream.

A battle has broken out between No10 and the Tory London mayor’s ­supporters after his popularity surged during the Olympics – and lifted his ­chances of taking over from Cameron.

In a boost for the “Boris for PM” drive, Tory MP Nadine Dorries yesterday tweeted: “In 2005, senior member of the cabinet told me to vote for David ­Cameron for leader as Boris wasn’t ready yet. He is now!”

Mounting support among Tories for Johnson has ­triggered urgent talks among the PM’s allies to stop him grabbing the spotlight at the Tories’ ­autumn conference.

A Cabinet source said: “This Boris love-fest has to stop. We won’t allow him to be the star turn at conference. That’s reserved for David Cameron. Boris is just part of the choir.”

The comments will infuriate Johnson supporters, who believe he will easily see off competition from embattled ­Chancellor George Osborne to succeed Cameron.

Last week, a poll found 36 per cent thought Johnson was suited to the job of PM – up 12 points from a similar poll in May. Allies of Cameron insist Johnson is merely enjoying an Olympic bounce in popularity – despite becoming a figure of fun after he was pictured dangling from a zip-wire ride.

But Johnson’s supporters claim they have their eyes on three constituencies as possible safe seats he could be parachuted into ahead of the 2015 general election.

That would leave him well placed for a run at the leadership if ­Cameron’s support among his right-wing MPs continues to falter.